GeekTool, one of the most powerful customization tools for Mac OS X, has been released into the Mac App Store. This version includes all the abilities of the downloaded app, with added App Store enhancements. It is available for absolutely free, as always.

Inbox2 is a desktop client that brings the social networks and email accounts under one roof. The social networks you can connect are Twitter, Facebook, Linkedin and email services like Gmail, AOL, Yahoo, Hotmail are also supported.

Taskbar Helper is a free tool that will let you hide opened windows in system tray while you minimize them. It can be done even if the program doesnâ€™t support this by default e.g Notepad, Chrome etc.